Curable composition

A curable composition which comprises:

• (A) an organic polymer having a silicon-containing group capable of crosslinking by siloxane bond formation,
• 0.5 to 5 parts by weight of (B) a silanol condensation catalyst containing an amine compound (B-1) having a melting point lower than 23° C. and optionally, a carboxylic acid metal salt (B-3), per 100 parts by weight of the (A) component and
• 1 to 10 parts by weight of (C) an adhesion promoter containing an amino group-containing silane coupling agent (C-1) and an epoxy group-containing silane coupling agent (C-2) per 100 parts by weight of the (A) component
• wherein
• the (A) component organic polymer is at least one polymer selected from the group consisting of polyoxyalkylene polymers and (meth)acrylate ester polymers
• wherein the component (B-1) is an amidine compound represented by the general formula (1):
• R1N═CR2—NR32 (1)
• wherein R1, R2 and the two R3 moieties each independently is a hydrogen atom or a monovalent organic group and any two or more of R1, R2 and the two R3 moieties may be bound together to form a ring structure and having a melting point of lower than 23° C.
• the ratio between the number (b3) of moles of the carboxylic acid metal salt (B-3) and the number (b1) of moles of the amine compound (B-1), namely the ratio (b3)/(b1), is 0 to not higher than 0.01 and
• the ratio between the total number (c1) of moles of the nitrogen atom in the amino group-containing silane coupling agent (C-1) and the total number (c2) of moles of the epoxy group in the epoxy group-containing silane coupling agent (C-2), namely the ratio (c1)/(c2), is not higher than 5.